Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
tranh luan » trinh luan, trinh luat, doanh luan
trang tuan » tran tuan, trung tuan, trong tuan
cong thanh » dong thanh, cong trinh, cong tan
thanh hang » thanh hoang, thanh thang, tranh hang
hieu lang » chieu sang, nhieu tang, hieu van
dung cong » dung trong
hang tap » hang tai, han tap, hang tmcp

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) OR (hieu quang)) - hanh ((tranh luan) or (trang tuan)) dung cong thanh hang tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (hieu quang)) - hanh ((tranh luan) OR (trang tuan)) dung cong thanh hang tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (hieu quang)) - hanh ((tranh luan) or (trang tuan)) dung cong thanh hang tap".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) OR (hieu quang)) - hanh ((tranh luan) or (trang tuan)) dung cong thanh hang tap*.